﻿/************************************************************************

   Extended Silverlight Toolkit

   Copyright (C) 2010-2012 Xceed Software Inc.

   This program is provided to you under the terms of the Microsoft Public
   License (Ms-PL) as published at http://extendedsilverlight.codeplex.com/license

   Please purchase a commercial version of this toolkit if you are using
   it in a commercial product. The commercial versions support the project,
   and also include more features for each control, priority support,
   source code, updates, removed watermark, and a proprietary license.

   Visit http://xceed.com and follow @datagrid on Twitter.

  **********************************************************************/

using System;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Ink;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;

namespace Xceed.Silverlight.DataGrid
{
  internal class DataGridCommand : ICommand
  {
    internal DataGridCommand( Action<object> executeDelegate )
      : this( executeDelegate, null )
    {
    }

    internal DataGridCommand( Action<object> executeDelegate, Func<object, bool> canExecuteDelegate )
    {
      if( executeDelegate == null )
        throw new ArgumentNullException( "executeDelegate" );

      // canExecuteDelegate can be null.

      m_executeDelegate = executeDelegate;
      m_canExecuteDelegate = canExecuteDelegate;
    }

    #region CanExecuteChanged Event

#if SILVERLIGHT
    public event EventHandler CanExecuteChanged;
#else
    public event EventHandler CanExecuteChanged
    {
      add
      {
        CommandManager.RequerySuggested += value;
      }

      remove
      {
        CommandManager.RequerySuggested -= value;
      }
    }
#endif

    internal void RaiseCanExecuteChanged()
    {
#if SILVERLIGHT
      if( this.CanExecuteChanged != null )
      {
        this.CanExecuteChanged( this, EventArgs.Empty );
      }
#else
      CommandManager.InvalidateRequerySuggested();
#endif
    }

    #endregion CanExecuteChanged Event

    public bool CanExecute( object parameter )
    {
      return ( m_canExecuteDelegate == null )
        ? true
        : m_canExecuteDelegate( parameter );
    }

    public void Execute( object parameter )
    {
      m_executeDelegate( parameter );
    }

    private Action<object> m_executeDelegate;
    private Func<object, bool> m_canExecuteDelegate;
  }
}
